Duplexer for simultaneous transmit and receive radar systems

Details Duplexer for simultaneous transmit and receive radar systems Duplexer for simultaneous transmit and receive radar systems

2005-08-08

2009-12-15

Lobo, Ian J (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

For receiver protection

C342S175000, C455S083000

Reexamination Certificate

active

07633435

ABSTRACT:
An enhanced duplexer (1) which includes a combination of high dynamic range (HDR) amplifiers (11, 17) and a naovel signal cancellation circuit topology (15). Return signals from the circulator (3) are fed into the first HDR amplifier (11). A portion of the transmit signal is sampled with a directional coupler (7) and amplified with a second HDR amplifier (17) and then combined with the output of the first HDR amplifier (11) using a second directional coupler (13). The gain and phase of the second io amplifier (17) are adjusted so the leakage signals are canceled (19, 21) to enable a radar system to simultaneously transmit and receive signals to and from an antenna with increased sensitivity of operation.

REFERENCES:
patent: 3021521 (1962-02-01), Hutchins
patent: 4968967 (1990-11-01), Stove
patent: 5010557 (1991-04-01), Chun
patent: 5534829 (1996-07-01), Kobayashi et al.
patent: 5835848 (1998-11-01), Bi et al.
patent: 6618002 (2003-09-01), Perry
patent: 6704349 (2004-03-01), Masenten
patent: 6721544 (2004-04-01), Franca-Neto
patent: 6784759 (2004-08-01), Maekawa et al.
patent: 6795690 (2004-09-01), Weissman et al.

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